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Finding the Fourth Proportional to 229.20, 343.89 and 99.20

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Solution

The fourth proportional to 229.20, 343.89 and 99.20 is: 148.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.20 : 343.89 = 99.20 : x
  2. Step 2: Convert to fraction form
    229.20/343.89 = 99.20/x
  3. Step 3: Cross multiply
    229.20x = 343.89 × 99.20
  4. Step 4: Simplify right side
    229.20x = 34,112.17
  5. Step 5: Solve for x
    x = 34,112.17/229.20
  6. Step 6: Final answer
    x = 148.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.